WO2015045865A1 - 無線基地局、ユーザ端末及び無線通信方法 - Google Patents
無線基地局、ユーザ端末及び無線通信方法 Download PDFInfo
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- WO2015045865A1 WO2015045865A1 PCT/JP2014/073884 JP2014073884W WO2015045865A1 WO 2015045865 A1 WO2015045865 A1 WO 2015045865A1 JP 2014073884 W JP2014073884 W JP 2014073884W WO 2015045865 A1 WO2015045865 A1 WO 2015045865A1
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- 238000004891 communication Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 27
- 238000013468 resource allocation Methods 0.000 claims abstract description 34
- 230000011664 signaling Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 description 35
- 230000004044 response Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 238000012937 correction Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 230000001413 cellular effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/002—Transmission of channel access control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Definitions
- the present invention relates to a radio base station, a user terminal, and a radio communication method in a next generation mobile communication system.
- LTE Long Term Evolution
- FRA Full Radio Access
- M2M Machine-to-Machine
- 3GPP Third Generation Partnership Project
- MTC Machine Type Communication
- MTC terminals are considered to be used in a wide range of fields such as electric (gas) meters, vending machines, vehicles, and other industrial equipment.
- the present invention has been made in view of such a point, and in a communication system in which the bandwidth of a physical downlink shared channel (PDSCH) is narrower than the system bandwidth, a radio base station capable of reducing communication overhead related to a control signal
- a radio base station capable of reducing communication overhead related to a control signal
- the radio base station of the present invention generates, for a user terminal, a resource allocation unit that allocates a physical downlink shared channel to a predetermined narrow band in a downlink system bandwidth, and downlink control information to be notified to the user terminal
- a downlink control information generating unit that performs allocation of a size of an area related to resource allocation information included in downlink control information related to the physical downlink shared channel by the physical downlink shared channel. It is characterized in that it is determined based on a narrow band to be determined.
- PDSCH physical downlink shared channel
- the mapping of the PDCCH to the radio resource element has a predetermined configuration.
- the said structure is based on the set of 36 resource elements called a control channel element (CCE), and comprises downlink control information (DCI) by one or several CCE.
- CCE control channel element
- DCI downlink control information
- a plurality of formats are defined for DCI according to the content notified from the base station to the user terminal.
- the user terminal needs to monitor a combination of CCEs called search spaces.
- the DCI format to be detected by the user terminal is DCI format 0 (DCI 0), DCI format 1A (DCI 1A), and one different DCI format (hereinafter referred to as DCI X).
- FIG. 1 shows the correspondence between the transmission mode of the radio base station and the DCI format to be detected by the user terminal. As shown in FIG. 1, DCI X depends on the transmission mode of the radio base station.
- DCI 0 and DCI 1A have the same message size and are determined by a 1-bit flag in order to suppress the maximum number of blind detection attempts per subframe in the user terminal.
- FIG. 2 is an explanatory diagram of the size of the DCI format to be detected by the user terminal. As shown in FIG. 2, DCI 1A is bit-padded with “0” to match the message size with DCI 0.
- FIG. 3 shows an explanatory diagram of the detailed configuration of DCI 0 / 1A.
- the “RA field” (resource allocation area) in FIG. 3 is an area related to resource allocation information of the physical uplink shared channel (PUSCH) in DCI 0, and an area related to resource allocation information of PDSCH in DCI 1A.
- the RA field includes information related to RB (resource block) allocation.
- the size of the RA field varies depending on the uplink / downlink system bandwidth, and is expressed by one of Equations 1 and 2 as a function of the system bandwidth. That is, the size of DCI 0 / 1A changes depending on the system bandwidth.
- FIG. 4 shows an example of PDSCH and PDCCH bandwidth allocated to a low-cost MTC terminal. Two correspondences are being studied in this configuration in which the PDSCH bandwidth is narrower than the system bandwidth.
- the first response is dynamic configuration.
- it is necessary to notify a frequency at which a reduced bandwidth in RF (Radio Frequency) is allocated and which band of the reduced bandwidth is allocated the PDSCH.
- RF Radio Frequency
- the second correspondence is a fixed / semi-static / predefined configuration.
- the fixed / semi-static / predetermined configuration it is more preferable in the low-cost MTC terminal because it is only necessary to notify which band of the reduced bandwidth the PDSCH is allocated.
- a fixed / quasi-static / predetermined configuration there is a problem that the size of DCI 0 / 1A depends on the system bandwidth as described above.
- FIG. 5 shows an example of the size of DCI format and communication overhead when the area related to resource allocation information depends on the system bandwidth.
- the “Size (6 RBs)” line indicates the size of each DCI format when the system bandwidth is 1.4 MHz (6 RBs), and the “Size (100 RBs)” line indicates the system bandwidth. Indicates the size of each DCI format when 20 MHz (100 RB).
- the system bandwidth is 20 MHz and the actual PDSCH bandwidth is 1.4 MHz.
- the size of the DCI format needs to be the size of the row of “Size (100 RBs)” even though the size of the row of “Size (6 RBs)” in FIG. 5 is sufficient.
- Unnecessary communication overhead occurs in the DCI size (“Unnecessary overhead” line in FIG. 5).
- DCI 1A an 8-bit communication overhead occurs. Since this communication overhead becomes a heavy load on the system as the number of terminals increases, it is a problem that cannot be ignored in view of the installation of a huge number of low-cost MTC terminals in the future.
- the present inventors reduce the communication overhead related to control signals by changing the RA field of the DCI format in a communication system in which the physical downlink shared channel (PDSCH) bandwidth is narrower than the system bandwidth. (Aspect 1/1 ').
- PDSCH physical downlink shared channel
- a low-cost MTC terminal is assumed as the user terminal, but is not limited thereto.
- FIG. 6 shows a detailed configuration of the DCI format 0 / 1A according to modes 1 and 1 '.
- 6A shows the configuration of DCI 0 / 1A according to aspect 1.
- the RA field is determined based on the bandwidth allocated to the PDSCH or PUSCH, not the system bandwidth.
- the size of the RA field is expressed by Equation 3 or 4, and is reduced from the original size expressed by Equation 1 or 2.
- FIG. 6B shows the configuration of DCI 0 / 1A according to aspect 1 '.
- the size of RA field is set to 0 as a configuration in which PDSCH / PUSCH is allocated to all the reduced bandwidths. That is, the RA field is not included (deleted) in the DCI format.
- RA field is 0 bits, the communication overhead related to DCI can be greatly reduced.
- the size of the DCI format can be greatly reduced according to the reduction of the transmission bandwidth of the shared channel.
- FIG. 8A and 8B respectively show typical configurations of DCI 1A (downlink scheduling grant, DL grant) and DCI 0 (uplink scheduling grant, UL grant) that are normally used in the LTE system.
- the size (bit unit) of the RA field in FIGS. 8A and 8B is expressed by Equations 5 and 6, respectively.
- Equations 5 and 6 are equal.
- DCI 1A When DCI 1A is set to the same message size as DCI 0 for blind decoding, it is necessary to perform additional 8-bit zero padding in aspect 1 and additional 13-bit zero padding in aspect 1 ′, which is effective. However, the size of the DCI format cannot be reduced. That is, when the mode 1/1 ′ is applied, the size of the DCI format cannot be effectively reduced if the bandwidths of PDSCH and PUSCH are greatly different.
- the present inventors further adopt a configuration in which the bandwidth of the PUSCH is narrowed in addition to the bandwidth of the PDSCH, and the size of the DCI 0 / 1A is made equal by reducing the size of the RAI field of the DCI 0.
- the communication overhead can be suitably reduced (Aspect 2/2 ′).
- the present inventors further favorably increase the communication overhead by configuring the DCI format having the same size for blind decoding not only with the combination of DCI 0 / 1A but also with the combination of DCI with the least padding. The idea was that it could be reduced (Aspect 3/3 ′).
- modes 2 and 3 are based on mode 1, and the RA field size is determined based on the bandwidth of PUSCH / PDSCH.
- modes 2 'and 3' are based on mode 1 ', and the RA field size is 0.
- modes 2 and 3 will be described in detail with reference to the drawings, but the same applies to modes 2 'and 3'.
- Aspect 2 limits not only PDSCH but also PUSCH bandwidth to be narrower than system bandwidth.
- FIG. 9 shows the bandwidths of PUSCH and PUCCH allocated to the user terminal.
- the PUCCH resources are arranged apart from each other, the frequency diversity gain is large as compared with the method of narrowing the system bandwidth itself.
- Aspect 2 is further divided into two according to the method in which the user terminal acquires information related to the reduced PUSCH bandwidth.
- the first is a method (Aspect 2-1) of notification from a radio base station by higher layer signaling (for example, RRC (Radio Resource Control) signaling).
- RRC Radio Resource Control
- the second is a method (mode 2-2) in which the user terminal determines a resource of the reduced PUSCH bandwidth according to a predetermined rule that is commonly recognized by the radio base station.
- mode 2-2 a method in which the user terminal determines a resource of the reduced PUSCH bandwidth according to a predetermined rule that is commonly recognized by the radio base station.
- FIG. 10 is an explanatory diagram of an operation sequence related to a random access procedure of the radio base station and the user terminal according to aspect 2-1. Since the user terminal has not established an RRC connection with the radio base station as an initial state, the user terminal is first called a random access preamble (RA preamble) via a physical random access channel (PRACH). A signal (Msg. 1) is transmitted to the radio base station (step ST11).
- RA preamble random access preamble
- PRACH physical random access channel
- the radio base station When the radio base station detects that the RA preamble has been received, it transmits a response signal (RA response, Msg. 2) to the user terminal (step ST12).
- Information included in the RA response includes an index number of a detected preamble, C-RNTI (Cell-Radio Network Temporary Identifier) as a user terminal identifier, transmission timing information (TA command), UL grant, and the like.
- the C-RNTI included in the RA response may be a temporary C-RNTI (Temporary C-RNTI). If the user terminal fails to receive the RA response after step ST12, the process may return to step ST11 to increase the transmission power and retransmit the RA preamble (Power ramping).
- the user terminal Upon receiving the RA response, the user terminal transmits a higher layer control signal (Msg. 3) including C-RNTI and the like using radio resources based on the transmission timing notified by the RA response (step ST13). ).
- a band defined in advance is used for transmission as a PUSCH bandwidth.
- the defined band is a band that is commonly recognized by radio base stations and user terminals as a band used for uplink signal transmission before RRC connection establishment, and may be, for example, the center 6RB of the system bandwidth.
- the radio base station When receiving the control information, the radio base station notifies the user terminal of control information (Msg. 4) for RRC connection or reconnection (step ST14). At this time, in order to enable the user terminal to detect a signal collision, the radio base station transmits the control signal including the control signal transmitted from the user terminal. Thereafter, RRC connection or reconnection is established between the user terminal and the radio base station (step ST15).
- control information Msg. 4
- the radio base station transmits the control signal including the control signal transmitted from the user terminal. Thereafter, RRC connection or reconnection is established between the user terminal and the radio base station (step ST15).
- the radio base station When the RRC connection is established, the radio base station notifies the user terminal of information related to the reduced PUSCH bandwidth by RRC signaling (step ST16).
- the bandwidth of PUSCH indicated by the notification is composed of continuous 6 RBs.
- the information notified by RRC signaling is only the index number of the head RB of the PUSCH bandwidth (the RB including the upper limit or the lower limit of the PUSCH bandwidth).
- the user terminal When transmitting a signal using PUSCH, the user terminal allocates and transmits to all or a part of the resource block indicated by the notified information about the bandwidth (step ST17).
- the radio base station can notify the user terminal of information regarding the reduced PUSCH bandwidth by RRC signaling as appropriate, and can change the setting (step ST18).
- aspect 2-1 can appropriately reduce the PUSCH bandwidth, unnecessary padding can be eliminated in reducing the size of DCI shown in aspect 1/1 ′, and communication overhead is preferably reduced. Can be reduced.
- FIG. 11 is an explanatory diagram of an operation sequence related to a random access procedure of the radio base station and the user terminal according to aspect 2-2. Since steps ST21, 22, 24, 25, and 26 in FIG. 11 perform the same processing as steps ST11, 12, 13, 14, and 17 in FIG. 10, the difference between mode 2-2 and mode 2-1 is hereinafter described. Only the point will be described. For aspect 2-2, RRC signaling does not increase compared to the conventional random access procedure.
- the PUSCH resource is determined according to a predetermined rule (step ST23).
- the predetermined rule is commonly recognized by the radio base station and the user terminal.
- the bandwidth of PUSCH determined by a predetermined rule is composed of continuous 6 RBs.
- it is preferable that only the index number of the head RB in which the PUSCH RB can be arranged is determined according to a predetermined rule.
- the index number of the head RB of the PUSCH bandwidth can be determined as in Equation 9 using the C-RNTI.
- the RB index number may be a fixed value.
- the user terminal transmits an upper layer control signal using all or part of the determined PUSCH resource (step ST24). Also, when transmitting a signal using PUSCH, the user terminal allocates and transmits to all or a part of resource blocks included in the determined bandwidth (step ST26).
- the PUSCH bandwidth can be appropriately reduced. Therefore, unnecessary padding can be eliminated in reducing the size of DCI shown in aspect 1/1 ′, and communication overhead is preferably reduced. Can be reduced.
- the DCI format having the same size is not limited to the combination of DCI 0 / 1A, but is configured by a combination that minimizes the padding bits.
- FIG. 12 is a conceptual explanatory diagram of aspect 3.
- the size difference of DCI 1A / X is smaller than other combinations of DCI, DCI 1A / X is configured to have the same size.
- the padding bits may not be “0”, but may be information used for predetermined processing.
- the padding bits can be configured to be used for DCI error correction.
- FIG. 13A shows a case where DCI 1A and 0 have the same size (case 1).
- DCI 1A is padded. That is, Case 1 is the same as the existing DCI format.
- the bits used for padding are not limited to “0” as described above.
- DCI before padding which is Case 1
- DCI 1A is 20 bits (Aspect 1 already applied)
- DCI X is An example is 30 bits (DCI 2C).
- FIG. 13B shows the case where DCI 1A and X have the same size (case 2).
- the DCI 1A is padded.
- DCI 1A is 20 bits (Aspect 1 already applied)
- DCI X is The case of 22 bits (DCI 1B / 1D (number of transmission antennas 2)) is mentioned.
- FIG. 13C shows a case where DCI 0 is smaller than DCI X and DCI 0 and X have the same size (case 3).
- DCI 0 is padded.
- DCI 1A is 20 bits (Aspect 1 already applied)
- DCI X is An example is 30 bits (DCI 2C).
- FIG. 13D shows a case where DCI 0 is larger than DCI X and DCI 0 and X have the same size (case 4).
- DCI X is padded.
- DCI 1A is 20 bits (Aspect 1 already applied)
- DCI X is The case of 28 bits (DCI 2A (number of transmitting antennas 2)) is mentioned.
- Each aspect of the present embodiment can be applied not only to PDCCH but also to EPDCCH (extended PDCCH). Also, each aspect of the present embodiment can be used for a search space unique to a terminal, particularly in an MTC terminal.
- FIG. 14 shows the size of the DCI format according to each aspect.
- DCI 2A was used as DCI X.
- a system hereinafter referred to as a conventional system in which the size of the DCI format depends on the system bandwidth and zero padding is applied to DCI 1A is shown.
- the modes 1 ', 2', and 3 'can further reduce the size compared to the modes 1, 2, and 3, respectively, because the RA field can be deleted.
- the padding bits of the mode 1/1 'can be reduced by the modes 2/2' and 3/3 '.
- PDCCH resources for example, the number of CCEs
- a predetermined coding rate is achieved when using a repetition method (a method for improving signal detection probability by transmitting a repeated signal). The number of repetitions can be reduced.
- FIG. 15 is an explanatory diagram of PUSCH scheduling gain according to each aspect.
- FIG. 15 shows the time variation of the band to which the PUSCH is allocated in each aspect.
- FIG. 15A shows the case of embodiments 1/1 'and 3/3'.
- FIG. 15B shows the case of the embodiment 2-1 / 2-1 ′.
- the PUSCH resource is selected in the region notified by RRC signaling.
- step ST18 of FIG. 10 when the reduced PUSCH bandwidth is reset, the PUSCH assignable region changes. Therefore, in FIG. 15B, the scheduling gain is moderate.
- FIG. 15C shows the case of the embodiment 2-2 / 2-2 '. In FIG. 15C, since the PUSCH bandwidth is determined according to a predetermined rule, it does not vary unlike FIG. 15B. Therefore, the scheduling gain of FIG. 15C is small.
- FIG. 16 shows an explanatory diagram of the DCI decoding process of the user terminal according to each aspect.
- FIG. 16A shows a DCI decoding process according to aspect 1/1 '.
- the flag bit when DCI is received, for DCI 1A / 0, it is necessary to check the flag bit for blind decoding.
- the flag bit since the DCI is DCI 1A, zero padding is removed to obtain DCI 1A.
- the flag bit when the flag bit is 1, since the DCI is DCI 0, the PUSCH transmission is performed thereafter.
- FIG. 16B shows DCI decoding processing according to aspect 2/2 '.
- aspect 2/2 ' it is necessary to perform resource allocation within the PUSCH bandwidth range notified or determined according to a predetermined rule at the time of PUSCH transmission.
- the error correction process is necessary.
- FIG. 16C shows a DCI decoding process according to aspect 3/3 '.
- an example of case 2 shown in FIG. 13B is shown, but the same applies to other cases.
- the error correction process is necessary.
- each aspect of the present embodiment can be selected according to the DCI format to be reduced and the required performance of the user terminal.
- FIG. 17 is a block diagram illustrating an example of a configuration of a radio base station.
- FIG. 18 is a block diagram illustrating an exemplary configuration of a user terminal. Note that the configurations of the radio base station and the user terminal shown in FIGS. 17 and 18 are simplified to explain the characteristic part of the present embodiment, and the normal radio base station and the user terminal are respectively provided. The configuration shall be provided.
- the radio base station includes a downlink control information generation unit 110, a resource allocation unit 120, and a downlink transmission data generation unit 130.
- the downlink control information generation unit 110 generates user terminal-specific downlink control information (DCI) transmitted by PDCCH or EPDCCH.
- DCI downlink control information
- the downlink control information generated by the downlink control information generation unit 110 is applied with encoding and modulation, and is output to the resource allocation unit 120.
- the downlink control information generation unit 110 includes a size determination unit 111, a base information generation unit 112, a DCI selection unit 113, a flag bit assignment unit 114, and a padding unit 115.
- the size determination unit 111 determines a size of an area related to resource allocation information included in the DCI format based on PDSCH / PUSCH bandwidth or system bandwidth information input from the resource allocation unit 120, and a base information generation unit 112 and the DCI selection unit 113. Specifically, in the case of the aspect 1/3, the size of the RA field is determined based on the PDSCH bandwidth for DCI 1A / X and based on the PUSCH or system bandwidth for DCI 0.
- the PUSCH bandwidth notified to each user terminal (aspect 2-1) or the PUSCH determined according to a predetermined rule
- the size of the RA field is determined based on the bandwidth (Aspect 2-2). Further, in the case of the mode 1 '/ 2' / 3 ', the RA field size can be set to zero.
- the base information generation unit 112 generates base information included in the downlink control information so as to conform to the DCI format, and outputs the base information to the flag bit adding unit 114.
- the DCI to be generated is specified according to the transmission mode, the scheduling information, and the size of the RA field input from the size determining unit 111, and base information to be included in the specified DCI is generated.
- the base information represents information excluding flag bits, padding bits, and CRC bits in the DCI format as shown in FIG.
- the DCI selection unit 113 selects two DCIs having the smallest size difference from the plurality of DCI formats determined from the transmission mode, and notifies the flag bit addition unit 114 and the padding unit 115 of the two DCIs.
- DCI 0 and 1A may be fixedly selected as the two DCIs.
- the flag bit assigning unit 114 assigns a flag bit for distinguishing two DCIs to the two DCIs selected by the DCI selecting unit 113 for the base information input from the base information generating unit 112, and the padding unit 115. Output to. However, for the mode 1/1 ′ / 2/2 ′, flag bits may be assigned to the DCIs 0 and 1A regardless of the DCI selection unit 113. Further, the flag bit assigning unit 114 outputs the DCI that does not need to be given a flag bit to the padding unit 115 as it is. Although the flag bit is 1 bit, it may be composed of a plurality of bits. Further, a predetermined bit of the base information may be used as a flag bit, and the flag bit adding unit 114 may not add anything.
- the padding unit 115 performs bit padding on the smaller-sized DCI notified from the DCI selection unit 113 among the base information including the flag bits input from the flag bit adding unit 114 and outputs the result to the resource allocation unit 120. .
- bit padding is performed to DCI 1A regardless of the DCI selection unit 113.
- the padding bits may be simply “0” or “1”, or may be bits generated according to a predetermined rule for use in error correction on the user terminal side.
- the resource allocation unit 120 allocates a signal obtained by encoding and modulating the control signal generated by the downlink control signal generation unit 110, the data signal generated by the downlink transmission data generation unit 130, and the like to the radio resource, and outputs the radio resource to the transmission unit. .
- the signal output to the transmitter is channel-multiplexed, and is transmitted as a downlink signal to the user terminal through various processes.
- the resource allocation unit 120 manages PDSCH / PUSCH radio resource allocation. Resource allocation is performed based on the PDSCH / PUSCH bandwidth and system bandwidth.
- the downlink transmission data generation unit 130 generates downlink transmission data for the user terminal. Downlink user data generated by the downlink transmission data generation unit 130 is encoded and modulated as downlink transmission data transmitted on the PDSCH together with higher control information, and is output to the resource allocation unit 120. In Aspect 2-1 / 2-1 ′, data for downlink transmission data generation section 130 receiving information on the PUSCH bandwidth from resource allocation section 120 and notifying the user terminal of the information by RRC signaling May be generated.
- the user terminal includes a downlink control information receiving unit 200, a resource allocation unit 220, and an uplink transmission data generation unit 230.
- the downlink signal transmitted from the radio base station is separated into downlink control information, downlink transmission data (including higher control information), etc. through various reception processes.
- the downlink control information is input to the downlink control information receiving unit 200.
- the downlink control information reception unit 200 includes a DCI acquisition unit 201, a DCI selection unit 202, a flag bit determination unit 203, and a padding removal unit 204.
- the DCI acquisition unit 201 acquires DCI from the input downlink control information and outputs it to the flag bit determination unit 203. At this time, error correction may be applied to the payload of DCI using CRC or the like.
- the DCI selection unit 202 selects two DCIs having the smallest size difference among a plurality of DCI formats determined from the transmission mode.
- information such as a transmission mode and a PDSCH bandwidth necessary for selection may be notified from the radio base station.
- the flag bit determination unit 203 determines whether the DCI input from the DCI acquisition unit 201 is the DCI selected by the DCI selection unit 202. If the DCI is selected by the DCI selection unit 202, the flag bits are removed, and the DCI that needs to be padded is output to the padding removal unit 204. Note that the flag bit may be implicitly associated with necessity / unnecessity of padding removal. For example, in a radio base station, when DCI having a flag bit of 0 is always a padding target, it is not necessary for the flag bit determination unit 203 to determine whether or not padding removal is necessary.
- the padding removal unit 204 removes the padding bits from the DCI base information input from the flag bit determination unit 203 and outputs the result to an appropriate output destination.
- the DCI is a DCI that does not require padding removal, such as a DCI not selected by the DCI selection unit 202, for example, the DCI is output to an appropriate output destination as it is. Note that error correction or the like may be applied using padding bits.
- the user terminal When the DCI received by the downlink control information receiving unit 200 is DCI 0, the user terminal transmits data to the radio base station via the PUSCH at an appropriate timing according to the scheduling information.
- the resource allocation unit 220 allocates a signal obtained by encoding and modulating the data signal generated by the uplink transmission data generation unit 230 to a radio resource, and outputs the radio resource to the transmission unit.
- the signal output to the transmitter is channel-multiplexed, and is transmitted as an uplink signal to the radio base station through various processes.
- the resource allocation unit 220 manages PUSCH radio resource allocation based on the PUSCH bandwidth and the system bandwidth. Specifically, for the mode 1/1 ′ / 3/3 ′, RB is selected from the system bandwidth and used for PUSCH transmission. In addition, with respect to aspect 2-1 / 2-1 ', an RB is selected from the PUSCH bandwidth indicated by the notification of RRC signaling and used for PUSCH transmission.
- the bandwidth that is commonly recognized by the radio base station and the user terminal is determined until the RRC connection is established and the information about the PUSCH bandwidth is notified by RRC signaling. Used for uplink signal transmission.
- an RB is selected from the reduced PUSCH bandwidth according to a predetermined rule and used for PUSCH transmission.
- the PUSCH bandwidth may be calculated using the C-RNTI notified from the radio base station by the RA response. In this case, since the C-RNTI is known to the radio base station, by sharing the calculation method between the radio base station and the user terminal, the radio base station does not directly notify the PUSCH allocated bandwidth, and the user terminal Can calculate the bandwidth of PUSCH.
- the uplink transmission data generation unit 230 generates uplink transmission data for the radio base station.
- the uplink data generated by the uplink transmission data generation unit 230 is encoded and modulated as uplink transmission data transmitted by the PUSCH together with the upper control information, and is output to the resource allocation unit 220.
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- the signaling method, the number of processing units, and the processing procedure in the above description can be appropriately changed and implemented without departing from the scope of the present invention.
- the present invention can be implemented with appropriate modifications without departing from the scope of the present invention.
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Abstract
Description
態様2は、PDSCHだけでなく、PUSCHの帯域幅もシステム帯域幅より狭く限定する。図9は、ユーザ端末に割当てられるPUSCH及びPUCCHの帯域幅を示している。態様2においては、PUCCHリソースが離れて配置されるため、システム帯域幅自体を狭くする方式に比べると、周波数ダイバーシティゲインが大きい。また、態様2は、低減されたPUSCHの帯域幅に関する情報をユーザ端末が取得する方法によって、さらに2つに分けられる。1つ目は、上位レイヤシグナリング(例えば、RRC(Radio Resource Control)シグナリング)により無線基地局から通知する方法(態様2-1)である。2つ目は、ユーザ端末が、無線基地局と共通に認識している所定の規則に従って、低減されたPUSCHの帯域幅のリソースを決定する方法(態様2-2)である。なお、以下の説明において、態様2と記載する場合は、態様2-1及び2-2をまとめて示している。
図10は、態様2-1における無線基地局及びユーザ端末のランダムアクセス手順に係る動作シーケンスの説明図である。初期状態として、ユーザ端末は、無線基地局との間でRRC接続を確立していないため、まず物理ランダムアクセスチャネル(PRACH:Physical Random Access Channel)を介して、ランダムアクセスプリアンブル(RAプリアンブル)と呼ばれる信号(Msg.1)を無線基地局に送信する(ステップST11)。
図11は、態様2-2における無線基地局及びユーザ端末のランダムアクセス手順に係る動作シーケンスの説明図である。図11のステップST21、22、24、25及び26は図10のステップST11、12、13、14、17と同様の処理を行うため、以降では態様2-2についての態様2-1との差異点のみを説明する。態様2-2については、従来のランダムアクセス手順に比べて、RRCシグナリングは増加しない。
態様3は、同一サイズとするDCIフォーマットを、DCI 0/1Aの組み合わせに限らず、最もパディングするビットが少なくなる組み合わせで構成する。図12に、態様3の概念説明図を示す。図12においては、DCI 1A/Xのサイズ差が、他のDCIの組み合わせより小さいため、DCI 1A/Xを同一サイズとなるように構成する。具体的には、DCI 1A/Xにフラグビット(Flag bit)を追加した上で、2つのうちサイズが小さいDCI 1AをパディングしてDCI Xのサイズと合わせる。ここで、パディングするビットは、“0”でなくても良く、所定の処理のために利用する情報としても良い。例えば、パディングするビットは、DCIのエラー訂正に用いるように構成することができる。
次に、本実施の形態に係る無線基地局及びユーザ端末の構成例について説明する。図17は、無線基地局の構成の一例を示すブロック図である。図18は、ユーザ端末の構成の一例を示すブロック図である。なお、図17、図18に示す無線基地局及びユーザ端末の構成は、本実施の形態の特徴部分を説明するために簡略化したものであり、それぞれ通常の無線基地局及びユーザ端末が具備する構成は備えているものとする。
Claims (10)
- ユーザ端末に対して、下りリンクのシステム帯域幅のうち所定の狭帯域に物理下りリンク共有チャネルを割当てるリソース割当て部と、
前記ユーザ端末に通知する下り制御情報を生成する下り制御情報生成部と、を有し、
前記下り制御情報生成部は、前記物理下りリンク共有チャネルに関する下り制御情報に含まれるリソース割当て情報に関する領域のサイズを、前記物理下りリンク共有チャネルが割当てられる狭帯域に基づいて決定することを特徴とする無線基地局。 - 前記リソース割当て部が、前記狭帯域の全体に特定のユーザ端末向けのリソースのみを割当て、
前記下り制御情報生成部が、前記特定のユーザ端末に通知する下り制御情報に含まれるリソース割当て情報に関する領域のサイズを0とすることを特徴とする請求項1に記載の無線基地局。 - 前記リソース割当て部が、前記ユーザ端末に対して、上りリンクのシステム帯域幅のうち所定の狭帯域に物理上りリンク共有チャネルを割当て、
前記下り制御情報生成部は、前記物理上りリンク共有チャネルに関する下り制御情報に含まれるリソース割当て情報に関する領域のサイズを、前記物理上りリンク共有チャネルが割当てられる狭帯域に基づいて決定することを特徴とする請求項1又は2に記載の無線基地局。 - 前記物理上りリンク共有チャネルが割当てられる狭帯域に関する情報を、前記ユーザ端末に上位レイヤシグナリングを介して通知することを特徴とする請求項3に記載の無線基地局。
- 前記物理上りリンク共有チャネルが割当てられる狭帯域は、
前記ユーザ端末が前記狭帯域に関する情報を受信していない場合には、前記無線基地局及び前記ユーザ端末に共通に認識される規定の帯域であり、
前記ユーザ端末が前記狭帯域に関する情報を受信した場合には、前記狭帯域に関する情報により示される帯域であることを特徴とする請求項4に記載の無線基地局。 - 前記物理上りリンク共有チャネルが割当てられる狭帯域を、前記ユーザ端末及び前記無線基地局に共通の所定の規則に従って決定することを特徴とする請求項3に記載の無線基地局。
- 前記ユーザ端末において検出対象となる複数の前記下り制御情報から、サイズ差が最小となる2つの下り制御情報を選択するDCI選択部と、当該2つの下り制御情報のうちサイズが小さい下り制御情報にビットパディングを適用して、当該2つの下り制御情報のサイズを等しくするパディング部と、を有することを特徴とする請求項1又は2に記載の無線基地局。
- 物理下りリンク共有チャネル及び物理上りリンク共有チャネルを介して無線基地局と通信するユーザ端末であって、
前記物理下りリンク共有チャネルが、前記無線基地局によって、下りリンクのシステム帯域幅のうち所定の狭帯域に割当てられ、
前記物理上りリンク共有チャネルが、前記無線基地局によって、上りリンクのシステム帯域幅のうち所定の狭帯域に割当てられ、
前記無線基地局から通知される前記物理下りリンク共有チャネルに関する下り制御情報に含まれるリソース割当て情報に関する領域のサイズが、前記物理下りリンク共有チャネルが割当てられる狭帯域に基づいて決定され、
前記無線基地局から通知される前記物理上りリンク共有チャネルに関する下り制御情報に含まれるリソース割当て情報に関する領域のサイズが、前記物理上りリンク共有チャネルが割当てられる狭帯域に基づいて決定されていることを特徴とするユーザ端末。 - 無線基地局が、ユーザ端末に対して、下りリンクのシステム帯域幅のうち所定の狭帯域に物理下りリンク共有チャネルを割当てるステップと、
前記ユーザ端末に通知する下り制御情報を生成するステップと、を有し、
前記物理下りリンク共有チャネルに関する下り制御情報に含まれるリソース割当て情報に関する領域のサイズが、前記物理下りリンク共有チャネルが割当てられる狭帯域に基づいて決定されることを特徴とする無線通信方法。
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